Non-linear magnetic diffusivity in mean-field electrodynamics |
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Authors: | V. Urpin A. Brandenburg |
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Affiliation: | Department of Mathematics, University of Newcastle, Newcastle upon Tyne NE1 7RU;A. F. Ioffe Institute of Physics and Technology, 194021 St Petersburg, Russia |
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Abstract: | We consider non-linear transport and drift processes caused by an inhomogeneous magnetic field in a turbulent fluid. The coefficients of magnetic diffusivity and drift velocity are calculated by making use of the second-order correlation approximation. Transport processes in the presence of a sufficiently strong magnetic field become anisotropic with larger diffusion rate and turbulent electrical resistivity across the field than along the field. Non-linear effects also lead to a drift of the magnetic field away from the regions with a higher magnetic energy. |
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Keywords: | MHD turbulence stars: magnetic fields ISM: magnetic fields |
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